This is the first volume of the "Miss Holmes Investigates" series, adapted into a film of the same name in 2020.
On the day of Enola's fourteenth birthday, her mother, Mrs. Holmes, suddenly disappears, leaving behind birthday presents filled with clues: a set of drawing tools, a book of flower meanings, and a slim codebook.
In desperation, Enola summons her eldest brother Mycroft and her second brother Sherlock from London. Although there is clearly more to their mother's disappearance, the two brothers focus only on how poorly their sister has been raised and how unladylike she is!
Before she can be sent away to boarding school against her will, Enola solves the mystery of her mother's departure. She decides to secretly leave home to search for her, escape her brothers' control, and bravely be herself. But just as she steps beyond the estate, she gets caught up in the kidnapping of a marquess...
Why did Mrs. Holmes leave home? What secrets do the birthday presents she left behind hold? Can the missing marquess be found? And what kind of future awaits Enola now that she has left home?
